319 



form, uniseptate. hyaline sporidia 10-12 x 3-4 //, slightly constrictor I 

 at the septum. 



On dead stems of Ambrosia trifida, Louisiana (Langloisi. 



D. subexserta, C. & E. 



Sphtzria subexserta, C. & E. Grev. VII, p. 42. 

 Didymella subexserta, Sacc. Sj'll. 2180, Cke. Syn. Pyr. 4408. 

 Exsicc. EH. X. A. F. 189. 



Perithecia scattered, depressed-globose, \ mm. diam., buried in 

 the substance of the stem, with the short-cylindrical, obtuse ostiolum 

 slightly projecting. Asci subclavate. about 60 t a long. Spori<li;i 

 biseriah 1 , narrow-elliptical, constricted and uniseptate in the middle. 

 ach cell 2-nucleate, 10-12 x 3-4 //. 



On dead stems of Lactuca Canadensis, Xewfield, X. J., and on 

 Lactuca Floridana, Louisiana (Langlois). 



D. fmctigena, E. & E. (in Herb.) 



Perithecia scattered or gregarious or 2-3 together, but not con- 

 fluent, 100-150 fj. diam., subglobose, prominent, but covered, except 

 the apex and papilliforni ostiolum, by the thin epidermis: when grow- 

 ing on the denuded cherry stones, superficial, with the base adnate. 

 Asci oblong-cylindrical, subsessile, 34-40x6-7 //, paraphysate. Spo- 

 ridia inordinate, oblong-fusoid, slightly curved, uniseptate and con- 

 stricted, the upper cell abruptly swollen just above the septum, the 

 lower cell narrower and acute, 12-15x3-3^ /*, hyaline. 



On dried up cherries (cult.), and on the bare cherry stones lying 

 on the ground, Xewfield, X. J. 



D. intercellnlaris, (B. & C.) 



Sph&ria inter cellularis, B. & C. Grev. IV, p. 153. 

 Didymella inter cellular is, Sacc. Syll. 2183, Cke. Syn. 4412. 



" Perithecia contained in the larger or dilated cells, about 50 jm 

 diam., with a few radiating threads. Asci short, thicker at the base. 

 Sporidia shortly cymbiform, uniseptate. 12-13 p. long." 



On Typha, Massachusetts. 



D. Nebraska, (B. & C.) 



Sphtzria Nebraska, B. & C. Grev. IV, p. 154. 

 Didymella Nebraska, Sacc. Syll. 2186, Cke. Syn. 4415. 



"Minute, shortly hysteriiform. Asci oblong, slightly swollen. 

 Sporidia elliptical, biseriate, uniseptate, 12-16 // long." 

 On leaves of grass, Xebraska. 



